docs: remove unnecessary nats server config option

Leftover from another project's nats config.

Signed-off-by: Alexander Trost <[email protected]>

Author: galexrt

README.md

@@ -147,7 +147,6 @@ If you are using the [NATS Helm Chart](https://github.com/nats-io/k8s), you can
 config:
   # [...]
   merge:
-    max_payload: 3145728 # user tracker can create big updates at the moment
     # JWT / Operator / System-account settings
     # Pass the operator- and $SYS-account JWTs (generated by the operator)
     operator: /etc/nkeys/operator/jwt